Jib type crane



Nov. 7, 1944- .A. SPOLIANSKY JIB TYPE CRANE Filed Sept. 2, 1943 INVENTUR I A.SF'EILIAN5KY IYZEIY X fim NEY Patented Nov. 7, 1944 JIB TYPE CRANE Alexander Spoliansky, New York N. assignor to Ingalls Iron Works Company, a corporation of Delaware Application September 2, 1943, Serial No. 500,907

3 Claims. (01'. 212-56) 7 This invention relates to ajib-type crane em bodying a fixed support and a Swinging support to which the jib ispivo tally connected, and has for an object the provision of suchacrane in which there shall be included means to control the relative angular movements of the jib and the swinging support;

A further object of my invention is to provide a jib type crane which includes a fixed support and a swinging support on which the jib is hinged to afford wider angular movement to the jib, and which shall embody gear means interposed between the jib and the fixed support to effect simultaneous controlled angular movements of the jib and the swinging supports.

Jib type cranes have heretofore been proposed in which the jib, instead of being pivoted directly to an upstanding support, was pivoted to a swing-:

ing support, which was in turn hinged to the fixed support. Suchcranes have a much wider possible angular movement than where the jib is pivoted directly to the fixed support. But where My invention contemplates a construction in which all the benefits of a multiple pivoted jib are obtained and at the same time, the jib and the swinging support move together and at proportional rates of movement. This is accomplished by mounting a segmental gear on the fixed support and a similar gear on the jib, in mesh with the gear on the fixed support, the latter being also fixed to the jib. With such an arrangement, when angular movement is. imparted to the jib, the gears in mesh cause the swinging support to move in the same direction but, with gears of the same diameter, at one half the angular rate Of the jib. In order to withstand the compressive forces at the bottom of the jib I provide means in addition to the gear which coact between the lower end of the jib and the fixed support.

Another feature of my invention is the provision of means for locking th jib and swinging support in fixed relation to the fixed support which feature is important in the handling of heavy loads around such places as docks and on ship board. v

Apparatus embodying features of my invention is illustrated in the accompanying drawing forming a part 'of this application, in which i Fig. 1 is a side elevational view of a jib type 2 .through an angle of 180 degrees.

crane constructed in tion; Fig. '2 is a plan view of the same; a Fig. 3is adetailed view of the bottom connection of a modified form of my invention; and i Fig. 4 is a sectional view taken along the line IVIV ofFig. 3. v Referring to the drawing for better understanding of my invention, I show a substantially accordance with my inven vertical fixed support III on which is hingedly ber I9 of the jib I3. At the lower end of the vertical member I9 is mounted a segmental gear 2|, similar to the gear I8, which meshes with a similar segment 22 mounted on the stationary support III. the stationary support Ill and extends outwardly beneath the gear 2I, to afford vertical and horizontal support to the jib.

As seen in Fig. 2 of the drawing, the bracket 23 has integral therewith a semicircular plate 24 having a semicircular slot 26 therein. On the lower end of the verticalmember I9 ofthe jib I3 is a pin 21 fitting into the slot 26. The pin 21 serves as a guide means for the lower end of the -jib and to take in part the horizontal thrust which would otherwise be imposed on the gears '2I=.and 22. Preferably a ball bearing 28 is interposed between the lower end of the vertical member I9 and the plate 24.

By reference to Fig. 2 of the drawing, I show the jib I3 in dotted position after the swinging support, or link II, has moved 45 degrees from the full line position of Fig. 2. It will be seen that while link II has moved only 45 degrees, the jib I3 has movedthrough an angle of degrees. When the link II has moved through an angle of 90 degrees, the jib I3 will have moved I thus obtain all the advantages of a multiple pivot with controlled relative movements between the jib and its swinging supports.

With especially heavy installations it sometimes becomes advantageous to employ the jib as a support for an overhead traveling crane. I accordingly show a diagonal brace 29 which may be detachably secured at 3I to the stationary support I0 and at 32 to the jib I3. The brace 29 has secured thereto a member 33 which may be A heaw bracket 23 is secured to I H, as by connection to the upper pivot pin Hi. When thus applied the upper surface of the jib I3 and the link or swinging support H, are in alignment. When so secured the rails 34 for an overhead crane 36 may be mounted on the upper surface of the jib and its swinging support.

In Fig. 3 I show a modified form of my invention in which a lower stationary bracket 36" is mounted on the vertical support ill. Pivotally mounted to the stationary support 36 is a lower swinging support 31, the pivot pin 38 for said support being, of course, in axial alignment with the pin 12. The lower end of the vertical mem ber I9, in accordance with this modification is provided with a pin 39 which pivots the lower end of the jib to the swinging support 31. The gears 2| and 22 are secured to'the lower end'of the vertical member and to the stationary sup placed thereupon as are specifically set forth in the appended claims.

What I claim is:

1. In a jib type crane, a vertical fixed support, a jib, a link connecting the upper end of the jib to the fixed support, segmental gears fixedly mounted on the fixed support opposite the lower and upper ends of the jib, similar segmental gears fixedly mounted on the jib at the upper .7 and lower ends to mesh with the first mentioned gears, and guide means coacting between the dower end of the jib and the fixed support and adapted to withstand the compressive forces at the lower end of the jib.

2.'Ina jib type crane, a vertical fixed support, 3

a jib, a link connecting the upper end of the jib tothe fixed support, segmental gears fixedly port I0 as already discussed in the description of Fig. 1. v 1

In accordance with the modification just described the support 31 is designed to withstand both the vertical and horizontal, loads imposed by the jib on the bottom support, and lessstrain is placed on the gears thanvis the case with the arrangement shown in Figs. 1 and 2, a

From the foregoing it will be. apparent that I have devised an improved jib type crane which mounted on the fixed support opposite the upper and'lower ends of the jib, similar segmental gears fixedly mountedv on the jib atv the upper and lower ends to mesh with the first mentioned gears, and a link connecting the lower end of the jib to the fixed support and adapted to withstand the compressive forces at the lower end of the is adapted for wide angularmovement and which embodies means for controlling relative movements. between the jib and its swinging support.

While I have shown my invention in but two forms, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes and modifications, without departing fromvthe spirit thereof, and I desire, therefore, that only such limitations shall be 

